406 



THE FOOD VALUES OF MILK 



It will be noted that milk contains ash for the building of 

 the frame of the body, proteins for the building of the muscle, 

 energy for the running of the machine, and vitamines of all 

 three kinds to keep the body well. 



INFANTS VS. ADULTS 



The food required by infants differs from that needed by 

 adults, only in two ways, viz.: (1) In the delicate condition or 



compos/ r/0A/ or the sol /as ofm/lk orvAffr/NQ rAT GftAoe 



any ma TTtn basis 



*ath> mv r» non'-fMTTr lotto*. 



rAr tr.tr 



r/tcrewMM. 



PtKClMT fXT so 



Fig. 131. — Emphasizing the change of the proportion of fat to non-fatty solids in the 

 solid matter of milk of varying fat grades; also that 2.43 pounds of low-priced solids 

 accompanied each one pound of fat in the 3.0 per cent milk, whereas, only 1.29 pounds of 

 cheap solids were required to be produced to accompany each pound of fat with a 7 per 

 cent milk. 



nature of the food, and (2) the ratio of nutrients>, or the pro- 

 portion of ash, protein, and energy required for growth, rather 

 than the amounts needed for maintenance of a mature body, and 

 for work. Moreover it has been shown by repeated tests that the 

 chemical composition of a food consumed by small, growing 

 animals determines the composition of the body produced by it. 

 In the author's experiments the ratio or proportion of muscle to 



